/* Reset dan styling dasar */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #e0f7fa, #ffffff);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    margin: 0 auto;
    box-sizing: border-box;
}

.container {
    width: 100%;
    max-width: 600px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin: 0 auto;
    position: relative;
    z-index: 10;
}

.page-header {
    background: linear-gradient(to right, #4fc3f7, #29b6f6);
    color: white;
    padding: 25px 20px;
    text-align: center;
    position: relative;
    z-index: 5;
}

.page-header h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
}

.header-description {
    font-size: 1rem;
    opacity: 0.9;
}

main {
    padding: 30px 20px;
    width: 100%;
}

.converter-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.category-selector {
    margin-bottom: 10px;
}

.converter-card {
    background-color: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    margin: 0 auto;
    width: 100%;
    max-width: 500px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

select, input {
    width: 100%;
    padding: 12px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1rem;
    background-color: #f9f9f9;
    transition: border-color 0.3s, box-shadow 0.3s;
}

select:focus, input:focus {
    outline: none;
    border-color: #4fc3f7;
    box-shadow: 0 0 0 2px rgba(79, 195, 247, 0.2);
}

.input-group {
    margin-bottom: 20px;
}

.unit-selectors {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.from-unit, .to-unit {
    flex: 1;
}

button {
    width: 100%;
    padding: 14px;
    background: linear-gradient(to right, #4fc3f7, #29b6f6);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(41, 182, 246, 0.3);
}

button:active {
    transform: translateY(0);
}

.result-container {
    margin-top: 25px;
    text-align: center;
}

.result {
    font-size: 1.5rem;
    font-weight: 600;
    color: #333;
    padding: 15px;
    border-radius: 6px;
    background-color: #f0f9ff;
    display: none;
    margin: 0 auto;
    width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.error-message {
    color: #d32f2f;
    font-size: 0.9rem;
    margin-bottom: 10px;
    display: none;
}

footer {
    text-align: center;
    padding: 15px;
    color: #666;
    font-size: 0.9rem;
    border-top: 1px solid #eee;
}

/* Responsivitas */
@media (max-width: 600px) {
    .unit-selectors {
        flex-direction: column;
    }
    
    .page-header h1 {
        font-size: 1.8rem;
    }
    
    .converter-card {
        padding: 20px 15px;
    }
    
    .result {
        font-size: 1.3rem;
    }
    
    .container {
        max-width: 90%;
        margin: 0 auto;
    }
    
    body {
        padding: 10px;
    }
}